Chapter 35

Power Supply Overview and Specifications

Darren Ashby and Tim Williams

35.1 Power Supplies

Whatever you do with electronics, you are going to need power to accomplish it. It will be useful to understand the basics of power supplies, as you are nearly guaranteed to deal with them at some point in your career.

35.1.1 It’s All About the Voltage, Baby!

Most devices today want to keep the voltage constant. This means that current can vary as needed. In the world of power, particularly as it relates to the ubiquitous IC, it often seems that you never have the exact voltage you want.

A huge number of products run off of 120 VAC out of a wall socket. Another huge group runs off of batteries that are charged from those wall sockets, and another significant ...

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